Echinoderm Flashcards
Echinoderm
a marine invertebrate
Endoskeleton
provide rigidity and protection
Pedicellariae
small wrench- or claw-shaped appendage with movable jaws
Madreporite
essential part of the circulation system
Radial canal
one of the numerous minute canals lined with choanocytes
Ring canal
the circular water tube that surrounds the esophagus
Arm / Ray
part of the body opposite the mouth
Radial Symmetry
five equal segments radiating from a central body
Bilateral Symmetry
the property of being divisible into symmetrical halves on either side of a unique plane
Water Vascular System
hydraulic system used by echinoderms
Ambulacral Groove
extends from the mouth to the end of each ray or arm
Gonads
sexual reproductive glands
Central Disc
five or more feathery arms radiating from a central disk
Tube Feet
small active tubular projections on the oral face of an echinoderm
External Fertilization
fertilization of eggs by spermatozoa